* Move access and repo permission to models/perm/access
* fix test
* fix git test
* Move functions sequence
* Some improvements per @KN4CK3R and @delvh
* Move issues related code to models/issues
* Move some issues related sub package
* Merge
* Fix test
* Fix test
* Fix test
* Fix test
* Rename some files
Unfortunately #17643 prevented all propagation of ErrDependenciesLeft meaning
that dependency errors that prevent closing of issues get swallowed.
This PR restores propagation of the error but instead swallows the error in the
places where it needs to be swallowed.
Fix#18223
Signed-off-by: Andrew Thornton <art27@cantab.net>
